Paving material.



E. J. LOVEGROVE & N. G. CROMPTON.

E. a. cnomwou, EXECUTRIX OF N. s. CROMPTON. nsc'u.

PAVING MATERIAL.

APPLICATION FILED MAR. 2. I915.

1,237,920 Patented Aug. 21, 1917.

7 V 12165665. Elven/602s 6. WW W 4 wum ti i To all whom it may concern:

EDWIN JAMES LOVE-GROVE AND NIGEL GEORGE CROIVIPTON, OF'LONDOIN', ENGLAND; ELIZABETH GERTRUDE CROMPTON EXECUTRIX F SAID NIGEL GEORGE GROMPTON, DECEASED; SAID EXECU'I'RIX ASSIGNOR TO SAID LOVEGROVE.

ravine MATERIAL.

- Specification of Letters Patent.

' 'Patented Aug. 21, 191W.

Application filed March 2, 191.5. Serial'No. 11,581.?

Be it known that we, EDWIN GROVE and NIGEL GEORGE CROMPTON, subjects of the Kin of England, both residing in London, Eng and, have invented certain new and useful Improvements in Paving Material, of which thefollowing'. is a specification.

This invention is for improvements in or relating to paving material of the kind commonly known as manufactured asphalt, which consists generally of finely-divided material such as sand or the like and bi-x tuminous binding or settingmaterial.

The present invention only has reference to a material which of itself alone will constitute a trafic-resisting surface. That is to say, it may be formed to any desired thick ness (for example one or more inches) and consolidated, as distinct from a dust-laying.

coat or a grouting for other paving materials such as macadam or the like.' A grouting has perviously been proposed consisting of approximately equal proportions of purified tar or pitch and retorted shale or residue or ash of shale that has been treated in'a retort or the like or calcined coal or the residue or ash of coal reduced to a fine impalpable powder. Such a composition cannot, of itself, constitute a pavingv material contemplated by the present invention.

According to the present invention our paving material consists solely of clinker or ash or like residue of combustion from a refuse destructor or incinerator, in a finely divided conditionadmixed, with a maxi mum of 20% of its weight of bituminous material.

Throughout the specification and claims- JAiccEs Lovn from destructor gases.

the ingredients to, during or subse-- quently to their admixture.

In a preferred method of preparing an asphalt or paving material according to the present invention, the clinker, ash or the like is derlved from a refuse destructor and is ground in an ordinary revolving mill or in an initially hot condition after removal from the destructor or alternatively it may be taken in a cold condition. After grinding, the material is screened through a small mesh screen and is thence conveyed to driers heated by waste gases from the destructor furnace. may be further sifted or separated and stored inbins until re uired for mixing or it may be conveyed direct to the mixers, where it is mixed with bituminous material.

The fine, material obtained from the screening operation is mixed with about 10* 20% of its weight of bitumen which may be The heated and dried material either native bitumen, or bituminous residuumof asphaltic oils, sometimes called petroleum pitch. The bituminous material is preferably preliminarily heated by heat from the destructor gases before passing into the mixing apparatus. The latter apparatus, however, may be heated during the mixing operation also by the heat derived The material is removed apparatus and is laid, while hot, in a loosened or powdered condition and consolidated (as for example by rolling or ramming) as an asphaltic layer or carpet one inch or thereabout in thickness, either on the surface of the road or path or upon a bituminous concrete, cement concrete or some other prepared foundation. The ingredients ma be conveniently mixed at a temperature i i-om about 275375 F. while the mixturemay be laid at a temperature from about 250350 F. f

It will be seen, therefore, that the products of refuse-destru'ctors are utilized to adfrom the mixing vantage both in the supply of material and of heat. In addition to the heating of the various apparatus as above described, the steam raised in the destructor boiler may be employed to drive the necessary machinery.

Such additional heat as may be necessary for the various apparatus employed (for them more fully herein. They may be The vied destructor residue when heated either by the waste gases from the destructor alone or by steam generated-by heat from the destructor gases or by both these sources of heat together, or by heat from aw. sources'or by any combination of these sources as may be convenient and p In a previously suggested paving composition dctor clinker has been screened to e on. cinders, coke residues, breeze and fine material and the remainder, consisting only of hard vitrified material which is not readily pulverizable, has been admixed with practically pure bituminous material and Portland cement. The latter ingredient is added to the mixture to fill-up not necessarily have any mechanically movthe at: between the coarse particles obtained fi-om the specially sifted destructor clinker. It has also been proposed to form paving blocks consisting of 80% crushed er, 15% Trinidad or other asphalt and 5% of fine limestone or other crushed will break up into pieces of angular formation and can readily be separated when pulverized into a large number of grades .or degrees offineness. Powdered stone and such like substances can ordi- 1 narily only be classified into three or four grades, whereas the destructor residue can beclasfied into about sixteen or ei hteen grades covering the same range 0 particles. As the material is broken up into usual screened material, it will pack together and consolidate in a much more satisfactory wayg than do other materials, and

advantage lies in the fact that --thecl1nker may be used in'a heated con- .dition' as it is removed from the furnace, obviates wholly or partially the necesity of uently heating it, or ifit.

is allowed to stand for some time after cooling, it can be conveniently stored so that the absorbed moisture does not assume so large a quantity as that contained inthe by an engine D which also obtains its steamfrom the boilerof the dust-destructor.

After the material has been dried it passes to a mixer E in which it is mixed with the bituminous material, an engineE obtaining its motive steam from the boiler of the dustdestr'uctor B driving. the mixing vanes or the like. The drier D and the mixer E may be heated as is diagrammatically represented by hot gases obtained from the dustdestroyer and conveyed through pipes F to the two apparatus.

It will be understood that the drier need ing parts but; may be simply a heated receptacle and further such an apparatus may be eliminated altogether. Similarly, it is not necessary that the mixer be heated although it is preferable that it should be so.

Although details of the preparation and composition of a paving material have been specifically quoted above, the invention is not limited to those details as they may be varied according to-the quality of the material required.

What we clann as our invention and desire to secure by Letters Patent is 1. A paving material consisting of pulverized refuse destructor residue of angular formation. and a bituminous binder.

2. A paving material consisting of pulverized refuse destructor residue of angular formation and 20 per cent. of its weight of bituminous binder.

formation and 10-20 of bituminous binder. In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses. V

EDWIN JAMES LOVEGROVE. NIGEL GEORGE CROMPTON. Witnesses:

HAROLD WADE, J HARBY'I. KIRBY,

3. A paving material consisting of pulverized refusedestructor residue of. angular per cent. of its weight v 

